Congrats to both of you! I'm glad you didn't get fixated by the woes expressed here. Hopefully you get flawless units; if not, Apple has great customer support.
BTW, the Crucial P/N is CT2KIT25664BC1067 4GB 204-PIN PC3-8500 SODIMM DDR3 Memory KIT (2GBx2). It has the correct specs so you don't have to worry about ECC, voltages and such.
Enjoy!